summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/prom_parse.c
blob: 47187cc2cf008c38e14c09667a7fff7b436d5dee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
#undef DEBUG

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/etherdevice.h>
#include <linux/of_address.h>
#include <asm/prom.h>

void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
		unsigned long *busno, unsigned long *phys, unsigned long *size)
{
	const u32 *dma_window;
	u32 cells;
	const unsigned char *prop;

	dma_window = dma_window_prop;

	/* busno is always one cell */
	*busno = *(dma_window++);

	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
	if (!prop)
		prop = of_get_property(dn, "#address-cells", NULL);

	cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
	*phys = of_read_number(dma_window, cells);

	dma_window += cells;

	prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
	cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
	*size = of_read_number(dma_window, cells);
}
OpenPOWER on IntegriCloud